/*
 * Poll-free SLV-IN (GPIO1/CD) edge monitor using POG422 driver ioctl.
 *
 *   ./gpio1_hs_monitor /dev/ttyXRUSB1
 */
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include "../xr_usb_serial_ioctl.h"

int main(int argc, char **argv)
{
	const char *port = (argc > 1) ? argv[1] : "/dev/ttyXRUSB1";
	int fd;
	struct xr_pog422_gpio1_event ev;

	fd = open(port, O_RDWR | O_NOCTTY);
	if (fd < 0) {
		fprintf(stderr, "open %s: %s\n", port, strerror(errno));
		return 1;
	}

	printf("gpio1_hs_monitor on %s (Ctrl-C to stop)\n", port);
	printf("waiting for XR_USB_SERIAL_WAIT_GPIO1 edges...\n");

	for (;;) {
		memset(&ev, 0, sizeof(ev));
		if (ioctl(fd, XR_USB_SERIAL_WAIT_GPIO1, &ev) != 0) {
			if (errno == EINTR)
				continue;
			fprintf(stderr, "WAIT_GPIO1: %s\n", strerror(errno));
			if (errno == EOPNOTSUPP)
				fprintf(stderr, "Driver may be BrainlyTree 1C without POG422 GPIO int.\n");
			close(fd);
			return 1;
		}
		printf("edge ns=%" PRIu64 " gpio_state=0x%04x gpio_int=0x%04x slv_in_active=%u\n",
		       (uint64_t)ev.timestamp_ns,
		       (unsigned)ev.gpio_state,
		       (unsigned)ev.gpio_int,
		       (unsigned)ev.slv_in_active);
	}

	close(fd);
	return 0;
}